Energy and Fatigue Archive

People with anemia have an abnormally low number of red blood cells. Those are the cells that pick up oxygen from the lungs, deliver oxygen throughout the body, and return to the lungs with a load of carbon dioxide and other gases to be exhaled. Without enough red blood cells, the organs and tissues don't get a sufficient amount of oxygen. That can cause nonspecific symptoms, such as fatigue, headache, or wooziness, which are often attributed to other causes. As a result, anemia often goes undiagnosed.

Many factors can diminish men's energy levels, which can lower their libido and sexual stamina. The most common factors are naturally declining muscle mass, less production of the energy-carrying molecules adenosine triphosphate, low testosterone levels, and poor sleep quality. Addressing these issues through diet, exercise, medical therapy, and practicing good sleep hygiene can help improve men's energy levels for sex and daily life.

A new study from the National Institutes of Health has performed more diverse and extensive biological measurements of people experiencing chronic fatigue syndrome than any previous research. Here's what they found and what it means.